JLCooper MCS3 SP USB for OSX - Manual (Page 25)

Special Tab
The Special Tab is a collection of actions that donʼt easily fit into other categories.
The choices are:
None No Special Action for the selected control. If some other type of
action has already been assigned, the None button will be selected.
Clicking on the None button will delete the currently assigned action.
Layer Selectors When assigned to an MCS3 SP button, that button can be used to
switch between layers. When a Layer Selector Special Action is
assigned to an MCS3 SP button, that assignment is automatically
copied to that button on all layers.
These options will not appear when the Jog Wheel or Shuttle Ring
are selected.
Developer Mode This is intended for use with applications which directly support the
MCS3. This action uses messaging protocols built into Mac OS X to
communicate with these applications.
You normally wouldnʼt use this mode unless you knew that an
application you were using supported it. 3rd party developers who
support this mode would typically ship MCS3 SP keysets along with
their applications.
For convenience, choosing Set all Controls to Developer Mode in
the Actions menu will assign Developer Mode Special Actions to
all of the MCS3 SP controls on all layers in the current keyset.
MCS3 SP USB Software
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